Responded to no-heat call where furnace would not start. Diagnosed stuck open limit switch due to homeowner forgetting to change filter after recent sheetrock work. Inspected heat exchanger (no defects found) while limit switch was removed. Noted significant rust on burners and in blower section/furnace deck, likely from previous AC condensate drainage issues. Provided estimate for replacement burners and discussed potential furnace replacement options with homeowner.
